61816142743387 has 4 divisors (see below), whose sum is σ = 61816530554800. Its totient is φ = 61815754931976.

The previous prime is 61816142743373. The next prime is 61816142743469. The reversal of 61816142743387 is 78334724161816.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61816142743387 - 2⁷ = 61816142743259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61816142743087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193666512 + ... + 193985437.

It is an arithmetic number, because the mean of its divisors is an integer number (15454132638700).

Almost surely, 2^{61816142743387} is an apocalyptic number.

61816142743387 is a deficient number, since it is larger than the sum of its proper divisors (387811413).

61816142743387 is a wasteful number, since it uses less digits than its factorization.

61816142743387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387811412.

The product of its digits is 32514048, while the sum is 61.

The spelling of 61816142743387 in words is "sixty-one trillion, eight hundred sixteen billion, one hundred forty-two million, seven hundred forty-three thousand, three hundred eighty-seven".